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Finding the Fourth Proportional to 980.58, 1,352.49 and 665.74

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Solution

The fourth proportional to 980.58, 1,352.49 and 665.74 is: 918.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.58 : 1,352.49 = 665.74 : x
  2. Step 2: Convert to fraction form
    980.58/1,352.49 = 665.74/x
  3. Step 3: Cross multiply
    980.58x = 1,352.49 × 665.74
  4. Step 4: Simplify right side
    980.58x = 900,405.03
  5. Step 5: Solve for x
    x = 900,405.03/980.58
  6. Step 6: Final answer
    x = 918.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.